Checking components and wiring

Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.

Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic pump side).

Check the hose between the leak diagnostic unit and the EVAP canister. Check for blockages.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information:

For resistance values, see Component specifications
To connect the breakout box, see Connecting the breakout box
To access or replace the leak diagnostic unit, see Leak diagnostic pump, replacing
To check the hoses, see Leak diagnostic pump, replacing
For information about signals on 5 cylinder engines, see Signal specification
For information about signals on 6 cylinder engines:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .
See Contents .

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.